JPS5922917B2 - Fixed structure of watch glass - Google Patents

Description

[Detailed description of the invention] The present invention relates to a watch glass fixing structure.

An example of a glass fixing structure using a conventional synthetic resin packing is shown in FIGS. 1 and 2.

In Fig. 1, a synthetic resin gasket 2 is compressed between the outer periphery of the glass 1 and the inner periphery of the body 3, and the glass 1 and the gasket 2 exert a frictional force, and the gasket 2 and the body 3 exert a frictional force. In addition, it is fixed in the axial direction due to the effect of the annular groove 3a.

In this case, the fixing force between the gasket 2 and the body 3 is
The fixing force in the axial direction of the glass is determined by the frictional force between the glass 1 and the packing 20, and therefore, sufficient fixing force and waterproofness can be obtained in the long term. Therefore, the amount of compression of the synthetic resin packing 2 in the radial direction must be set large.

However, if the amount of compression is increased, when the synthetic resin packing 2 is attached to the outer periphery in advance and pushed in, the packing 2 will protrude upward a lot, making it impossible to obtain reliable fixing force and waterproofness. .

In FIG. 2, between the glass 4 and the body 6, a synthetic resin gasket 5 having a higher height than the outer circumferential rising portion 4b of the glass 4 and the inner circumferential rising portion 6b of the body 6 is compressed by a device, and the synthetic resin is further compressed. The upper part 5a of the resin pankin 5 is collapsed onto the glass upper slope 4a and the lower slope 6a of the body 6, whereby the glass 4 is compressed and fixed in the radial and axial directions.

In this case, the synthetic resin packing upper part 5a that has fallen down on the glass upper slope 4a and the synthetic resin packing thick part 5b,
The glass 4 is fixed in the axial direction, and at first glance it seems possible to obtain a more reliable fixing force compared to the structure shown in Figure 1, but when we examine this in detail, we find that the glass 4 The upward fixing force is determined mainly by the bending strength of the synthetic resin packing upper part 5a,
The necessary fixing force cannot be obtained with the packing 5 made of synthetic resin, which is an elastic material.

As mentioned above, in both cases of the known examples shown in FIGS. 1 and 2, stable fixing force and waterproofness cannot be obtained, and furthermore, the outer periphery of the glass is surrounded by a large width of packing with a considerable thickness. This is a major constraint on the appearance design.

In particular, in the case of the example shown in FIG. 2, the upper part 5a of the gasket is crushed and becomes wider, so this restriction is particularly significant.

The present invention eliminates the above-mentioned drawbacks of the conventional art, and includes incorporating the glass from above the body or glass edge, and further compressing the thick part of the synthetic resin packing downward on the bottom surface of the glass so that it is applied to the top surface or upper slope of the glass. The upper part of the synthetic resin gasket is made to stick out and undergo plastic deformation to securely fix the glass for a long period of time, and also to improve waterproofness and ease of installation.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 3 is a sectional view showing the pre-assembled state, and FIG. 4 is a sectional view showing the fully assembled state.

In Figure 3, 7 is the glass 1. 7a is the upper slope of the glass, 7
b is a rising portion on the outer periphery of the glass, and 7c is an upper slope of the glass.

An annular groove for accommodating a synthetic resin packing 8 is provided on the inner periphery of the shell 9, and the inner diameter A of the upper flange portion 9d of the shell 9 is slightly larger than the outer diameter B of the glass.

9a is the upper surface of the annular groove, 9b is the rising edge of the annular groove, and 9c is the lower surface of the annular groove.

A synthetic resin gasket 8 is installed in the annular groove in advance, and the inner diameter of the contact surface with the outer periphery of the glass is set so that it fits with the outer diameter of the glass with a very loose tightening allowance. , it is inserted very lightly until it hits the thick part 8b of the synthetic resin packing.

From this state, by further pushing down the glass T, the thick part 8b of the synthetic resin seal is removed from the upper slope 1c of the glass.
It is inserted into the lower surface 9c of the annular groove and compressed, and at the same time, it protrudes from the gap C1 between the outer periphery 7b of the glass and the inner periphery of the upper flange portion 9d of the body 9, covers the upper slope 7a of the glass, and is plastically deformed.

In this way, the installation of the main frame 0 is completed.

FIG. 4 shows a sectional view of the assembled state.

Incidentally, the bending stress generated in the protruding portion of the upper part 8a of the packing when a force in the direction of removal is applied to the glass 7 can be reduced by setting the clearance C2 between the glass 7 and the inner diameter of the upper flange portion 9d of the body 9 small. , it is possible to make it sufficiently small, and an extremely large force for fixing the glass can be obtained even if a packing made of synthetic resin, which is an elastoplastic body, is used.

The requirements for the synthetic resin punching material that make the present invention particularly effective are that it can be appropriately plastically deformed by compression, and at the same time be able to maintain an appropriate internal stress for a long period of time without losing its initial elasticity even after plastic deformation. .

In the embodiment of the present invention, a thermoplastic polyester elastomer is used, and this material has a compression set of 30π to 70π (70° C.) according to JIS 6301 and satisfies the above requirements.

Figures 5.6.7 and 8.9 show other embodiments of the invention.

In FIG. 5, 10 is glass, 11 is a synthetic resin gasket, and 12 is a glass edge.

In this example, the packing upper part 11a falls down on the glass top surface 10a, and the upward fixing force is stronger than in the case of the slope.

In the case of FIG. 6, a ring step 13a is provided on the outer periphery of the glass 1.3, and the upper part of the synthetic resin gasket 14 is collapsed onto the upper surface of the ring step 13a to increase the fixing force.

In addition, as the fixing member for fixing the glass, the above-mentioned barrel,
In addition to the glass rim, there are bands, etc.

The present invention is as described above, and particularly when applied to assembling on glass, it is easy to assemble, there is little risk of a decrease in yield due to scratches and dirt during assembly, and the component parts are simple. With fewer parts, it is possible to securely fix the glass and maintain waterproofness over a long period of time.

Furthermore, the present invention is characterized by a structure and an assembly method that are basically the same as the conventionally widely used structure using L-shaped or ■-shaped packings made of synthetic resin, and it does not require the use of conventional manufacturing equipment and technology. This can be achieved with a wide range of changes, and the outer periphery of the glass is not surrounded by a large seal, which eliminates major constraints on the exterior design.

In addition, in the case of a conventional waterproof structure using irregularly shaped glass, variations in the amount of compression of the seal due to the machining accuracy of the glass outer profile and the inner profile of the glass fixing member such as the body and bezel will result in a stable glass fixing force and waterproofing. However, with the structure of the present invention, it is now possible to easily compensate for variations in the amount of packing compression due to profile machining accuracy by the amount of crushing of the thick part of the synthetic resin packing. Dogs contribute to quality improvements, such as improving waterproofness and strengthening the fixing force of glass.

As described above, the present invention has been able to realize many benefits that were not available in the prior art.

[Brief Description of the Drawings] Figs. 1 and 2 are longitudinal sectional views showing a conventional glass fixing structure, Fig. 3 is a longitudinal sectional view showing an embodiment of the present invention in a pre-assembled state, and Fig. 4. 5 is a vertical sectional view showing an embodiment of the present invention in a completed assembled state, and FIGS. 5 and 6 are longitudinal sectional views showing other embodiments of the present invention. 1. 4,7,10.13...Glass, 2,5,8°ICl3...Packing, 3,6,9...Body, 12°15...Glass edge.

Claims (1)

[Scope of Claims] 1. A glass fixing member having an annular groove on its inner peripheral surface consisting of an upper flange portion, a rising portion, and a lower surface, and a synthetic resin having a thick wall portion at the lower portion and accommodated in the annular groove. a synthetic resin packing, an outer peripheral portion that is smaller than the inner diameter of the upper seven flange portions of the annular groove and loosely fits into the inner diameter of the synthetic resin packing, and a lower slope that strongly compresses the upper thick part of the synthetic resin packing. The synthetic resin gasket is placed in an annular groove whose lower surface is smaller than the outer periphery of the watch glass, and the watch glass is placed inside the synthetic resin gasket at the upper flange of the annular groove. Insert from the side, and strongly compress the thick part of the synthetic resin packing with the lower slope of the watch glass, causing the upper part of the synthetic resin packing to protrude from between the watch glass and the upper flange part, and causing it to protrude. A watch glass fixing structure characterized by fixing the watch glass only with synthetic resin gaskets. 2. The watch glass fixing structure according to claim 1, wherein the synthetic resin gasket is made of thermoplastic elastomer. 3. The watch glass fixing structure according to claim 1, wherein the glass fixing member is a glass edge or a body.